Zn-27 Al-2.7 Cu-0.03 Mg-0.5Mn合金过冷β相分解产物及性能  

Overcooling β-phase Decomposed Structure and Mechanical Properties of Zn-27Al-2.7Cu-0.03Mg-0.5Mn Alloy

作　　者：赵品[1] 沈焕祥[1] 赵恩生 

机构地区：[1]河北省亚稳材料制备技术与科学重点实验室,燕山大学材料学院,河北秦皇岛066004 [2]戴卡汽车轮毂有限公司,河北秦皇岛066000

出　　处：《有色金属》2004年第2期1-7,共7页Nonferrous Metals

基　　金：河北省自然科学基金资助项目 ( 5 992 3 6)

摘　　要：利用Formastor F膨胀仪测定过冷 β相等温分解曲线 ,借助KYKY 80 0扫描电镜观察铸态与等温分解组织 ,研究不同热处理工艺对Zn 2 7Al 2 7Cu 0 0 3Mg 0 5Mn合金显微组织和机械性能的影响。结果表明 ,合金元素的加入使过冷 β相稳定性增加 ,TTT曲线右移。采用适当的热处理工艺可使合金强韧化 ,拉伸断口由脆性的沿晶断裂变为韧窝状断裂。By determination of the isothermal transformation curve of overcooling β-phase of the Zn-27Al-2.7Cu-0.03Mg-0.5Mn alloy with dilatometry and observation of the microstructure of as-cast and isothermal transformation of the alloy with KYKY2800 scanning electron microscope, the influence of heat treatment technology on the microstructure and mechanical properties is investigated. The results show that the stability of overcooling β-phase is increased and the TTT curve is rightward moved by addition of the alloying element. By way of suitable heat treatment, the tensile fracture morphology changes from brittle intercrystalline fracture to dimple fracture, so the strength and ductility of the alloy is increased.

关 键 词：ZA-27合金 等温分解 力学性能 超塑性 扫描电镜 显微组织 

分 类 号：TG146.13[一般工业技术—材料科学与工程]